Brittany-
Does your dog seem to itch a lot? He/she might have allergies to the food you have her on or allerigies coming from other things such as air born-pollen allergies. I don't know the exact term for the inhalent allergies. My best guess would be that your dog is itching in specific spots so much that the hair has begun to break off due to the itching. The same thing has happened to Thor my dog. What kind of food are you using? Make sure there isn't any corn in it as that can cause itching. Also try a oatmeal shampoo, and don't over wash your little guy. I will try to post a list of recomended foods if I can find it. Good luck with your dog and her/his bald spots
Hannah